One USB cable can now carry both data and a lot of power. The USB Implementers Forum (USB-IF), which publishes the standard, explains how, and how certification works.

This guide is based on the public sources listed at the end. We have not tested the products or services mentioned.

This is a short reference page. The full guide is Travel and Gadgets: Power Banks on Planes, Hand Luggage Liquids, USB-C Power and Safe Listening.

What USB PD does

USB Power Delivery (PD) lets USB carry more power and data over one cable. Devices negotiate how much power they need, and either side can supply it.

100 W and 240 W

  • Before revision 3.1 (announced 2021), PD was limited to 100 W: 20 V at 5 A, with cables rated for 5 A.
  • Revision 3.1 raises the maximum to 240 W, using fixed voltages of 28 V, 36 V and 48 V (for 140 W, 180 W and 240 W) and an adjustable mode.
  • USB Type-C release 2.1 defines the 240 W cable requirements.

Certification

The USB-IF says companies need a current trademark licence to use certified USB logos, and that products must pass compliance testing and appear on the Integrators List and the Certified Product List. The page does not explain what individual logos mean, so do not rely on a logo alone.

Buying checklist

  1. Check the wattage your device needs and that the charger can supply at least that.
  2. Find the cable's power rating on the cable or the listing. The wattage of a cable is stated there, not on a logo.
  3. Check the product on the USB-IF Integrators List.
  4. Buy from sellers that show the full model number.
  5. Stop using a damaged cable or a swollen power bank.

More in our guide to chargers, cables and power banks.

Last checked: 15 October 2026. Sources: USB-IF, USB charger and Power Delivery.